| Full text | |
| Author(s): |
Dias, W. S.
[1]
;
Monteiro, H.
[1]
;
Lepine, J. R. D.
[2]
;
Prates, R.
[3]
;
Gneiding, C. D.
[3]
;
Sacchi, M.
[4]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Itajuba, Inst Fis & Quim, Itajuba, MG - Brazil
[2] Univ Sao Paulo, Geofis Ciencias Atmosferi, Inst Astron, Sao Paulo, SP - Brazil
[3] Lab Nacl Astrofis, Rua Estados Unidos 154, BR-37504364 Itajuba, MG - Brazil
[4] Charles Sturt Univ, Sch Teacher Educ, Grange Chancellery, Panorama Ave, Bathurst, NSW 2795 - Australia
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 481, n. 3, p. 3887-3901, DEC 2018. |
| Web of Science Citations: | 11 |
| Abstract | |
We present a study of seven southern open clusters based on UBVRI CCD photometry (Johnsons-Cousins system) and Gaia DR2 data. Dias 4, Dias 6, and four other clusters had UBVRI photometric observations determined for the first time. From the observational UBVRI data we obtained photometric membership probability estimates and, using the proper motions from the UCAC5 catalogue, we also determined the kinematic membership. From Gaia DR2 astrometric data we determine the stellar membership using proper motions and parallaxes, taking into account the full covariance matrix. For both independent sets of data and membership we apply our non-subjective multidimensional global optimization tool to fit theoretical isochrones to determine the distance, age, reddening, metallicity, and binary fraction of the clusters. The results of the mean proper motions, distances, and ages are in agreement, but the ones obtained from Gaia DR2 data are more precise in both membership selection and estimated parameters. In the case of NGC 6087, the Cepheid S Nor, member of the open cluster, was used to obtain an independent distance estimate, confirming the one determined by our fitting method. We also report a serendipitous discovery of two new clusters in the extended field near what was originally Dias 4. (AU) | |
| FAPESP's process: | 13/01115-6 - A study of the galactic structure by means of open clusters |
| Grantee: | Jacques Raymond Daniel Lépine |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - Brazil |